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Osvaldo Pezoti Jr,Andre´ L. Cazetta,Isis P.A.F. Souza,Karen C. Bedin,Alessandro C. Martins,Tais L. Silva,Vitor C. Almeida 한국공업화학회 2014 Journal of Industrial and Engineering Chemistry Vol.20 No.6
The present study reports the preparation of an activated carbon produced from buriti shells (ACb) usingZnCl2 as activating agent and its ability to removemethylene blue dye (MB) from aqueous solutions. Theobtained ACb was characterized by N2 adsorption–desorption isotherms, SEM and FT-IR. The resultsshow that ACb presents microporous features with BET surface area (SBET) of 843 m2 g-1 and functionalgroups common in carbonaceous materials. Adsorption studies were carried out and experimental datawere fitted to three isotherm models (Langmuir, Freundlich, and Redlich–Peterson) and four kineticmodels (pseudo-first order, pseudo-second order, Elovich, and intraparticle diffusion). The isothermmodel which best fitted to experimental data was Redlich–Peterson. However, the g parameter of thismodel indicated that the adsorption of MB onto ACb occurs according to the mechanism proposed byLangmuir, which showed maximum monolayer adsorption capacity of 274.62 mg g-1. Kinetic studiesdemonstrated that the Elovich model is suitable to describe the experimental data. Moreover, it wasfound that the intraparticle diffusion is the limiting step of adsorption process.